UNIX for Dummies Questions & Answers

for x in `cat address.list` ;
do echo "results for $x" ;
grep $x someconfig.file ;
echo "---------------------------------------------" ;
done

while read x
do
  echo "results for $x"
  grep -w "$x" someconfig.file
  echo "---------------------------------------------"
done < address.list

-w Select only those lines containing matches that form whole words.

while read IP
do
        IP="${IP//./\\.}" # Turn . into \., since . is special to awk
        echo "(^|[^0-9])${IP}($|[^0-9])"
done < address.list > address.regex

egrep -f address.regex configfile

 -f FILE, --file=FILE
	      Obtain  patterns	from  FILE, one per line.  The empty file con-
	      tains zero patterns, and therefore matches nothing.

grep -wf address.list /path/to/other.file